Pressure-regulator.



(5. 8. MELEHER. PRESSURE REGULATOR. APPLICATION FILED AUG.8,91-6.

Eatent-e 3 14, 1919.

3 SHEETS-SHEET 1.

G. S. IJHZLCHERa PRESSURE PiEGULATORi APPLICATION FILED AULLB 19x6.

Patented Jan. 14,1919.

3 SHEETSSHEET 3.

the lever 20 is horizontfl, the ports 35, 37 are closed by the valve members 33 and 31. When the valve members 33 and 3a are raised, water from the inlet port 30 will be admitted tothe right hand end of the cylinder 25 as seen in the drawings through the port 35 and passage 38 and at the same time the water in the cylinder on the other side of the piston 26 will be exhausted through the exhaust passage 39 and out through the exhaust port 31. On the other hand when the valve stem 32 is moved downwardly the action is reversed and the inlet port 30 is connected with the left hand end of the cylinder by the port 37 Under these circumstances water is exhausted from the cylinder through passage 38, port 35 and out through the exhaust passage 31 by way of the space around the valve stem 32.

The pilot valve 29 is operated by means of a lever extension member -10 rigidly secured at one. end to the lever 20 at 41, the free end of which is p votally connected which surrounds the body of the valve 29 and which is in turn pivotally connected to the valve member 32. The recess 12 be neath the diaphragm 13 is connected to the boiler pressure or other pressure to be controlled through a port 43 which communicates .with a pipe 44:. Whenever the 'pressure to be governed exceeds a predeteri'nined amount as regulated by the weight 21 atthe end of the lever 20 the diaphragm 13 will be raised from the horizontal position shown and consequently move the lever 20 and weight 21 upwardly about the lugs 22 as a pivot. Such a movement will actuate the member 32 of the valve 29 downwardly and consequently will admit pressure to the left hand end of the cylinder 25 in the manner described above and cause the piston 26 and rod 27 to be moved to the right and the damper or other controll'ng device to be closed shutting off the d aft and reducing the pressure to be regulated. On the other hand if the pressure in theidevice being governed drops below the pre Jtermined amount the weight 21 will overco ne the .said pressure beneath the diaphragm 13 and will consequently lift the valve-member 32 and cause the piston 26 and rdd '27 to. be moved to the left and thereby damper or like controlling device so that the pressure is increased. It will be seen,

.would result in however, that if the valve members 33 and 3e are given movements directly proportional to the weighted lever 20 the tendency {would be to open the pilot valve wide which moving the piston the extreme length of the cylinder each time that the pilot valve moved and thus would open the damper wide or close it completely with fuel and greatly in- In order toinsure rooer compensation I I. p l .L 7

with a yoke 45. The'piston rod 2 will Open the boiler.

. seen from he above I provide improved means for automatically varying the pressure on the diaphragm so that any change in pressure beneath the dia-' phragm is met by a corresponding resistance to that pressure above that the parts are returned to balance. This is accomplished by providing a weight holder 15 having any desired. number of \weights 46 which is supported on rollers -17 journaled in a hanger 48 secured to the holder' li- The rollers 17 are arranged to run on the lever 20 so that the holder 45 may be moved lengthwise of the lever. The holder 15 is connected to the the diaphragm so which is in turn outer end of the piston rod 27 by means of a link 49 pivoted at one end to the hanger 4:8 and at the other end to an arm 50, secured to the piston rod 27. At 51 is shown a jaw which is fast on the rod 27 and adapted to be connected with a connection with a damper 99 or other pressure controlling device.

It will be seen from the above that if pres sure beneath the diaphragm 13 increases for damper chain 98 in example, and the piston rod 27 is accordingly moved outwardly and consequently starts to close 'thefiue damper 99 in the boiler to check the draft, tacle 45 will also be moved outwardly on the the weight receplever 20 and on account of the greater leverage will add additional resistance to the resistance already subjected to .the uppersurface of the diaphragm 13 by the weight 21. The diaphragm 13, therefore, will immedi ately. be'forced downwardly again so that 100 the member 32 of the pilotvalve 29 .will be raised and the pilot valve'.closed thereby preventing any further. entrance of water into the cylinder 25. In this manner the piston rod 27 will beheld in the position given 1 05 and the damper or other controlling device will also be prevented from further movement until a further change -ininitial pressure'takes place. If the position of the damfper isnot-such ciently to prevent a still further increase in boiler pressure, the diaphragm 13-willagain cause the piston rod 27,.to be moved still farther outwardly together with the weight.

and the damper held in its. newposition. If the initial pressure decreases the piston rod as to check the draft sufiiwill again be checked 111 will be moved inwardly and .the damper checked by means of the weight 45 which" will be moved inwardly on the thereby lessening the resistance. It will be ment isgraduated and only suiiicient to give that the damper move-i.

lever :20 .12

the proper'amount of damper opening tog J effect the desired rate of combustion. For 12 thelfigffitiwillhenoted that therangeoti pressure variation i l adapted to ",which "the device is F is not limited as indevices as here tofore' constructed so'far as knownlto me, namely, by the limit of movement of the dim 1:

. form of device embodying my invention in other end to a weight carriage 72.

which an upright damper regulator isprovided with a compensating device operating on the principle described above. In this .device the cylinder 25 has the usual piston 'rod 27 which is arranged to close the flue damper when it moves outwardly and to open it when it moves inwardly in the same manner as the device shown in Fig. 1. The pilot valve 61 is connected at one side 'of the cylinder 25 and arranged to operate the piston 26 so that it moves outwardly with a rise in pressure and vice versa as is the case with the device described above. The piston rod 27 is provided with an arm 62 which is in turn secured to a rod 63 having near its lower end an arm 64 to which is secured a belt or chain 65. The belt or chain 65 passes upwardly over a pulley 66 journaled to a support 67 on the cylinder 25 and downs wardly around one of a pair of pulleys 68 rigidly attached to a shaft 89 journaled to a bracket .69 secured to the base 70 of the device,"to which pulley the said chain is secured. A chain 90 is' secured atone end to the other of the said pulleys 68 and at ltge e welght carriage 72 travels on rollers 73 adapted 'to run upon the lever 71 and at its lower end is arranged to support a plurality of weights 7 1. At 75 the lever 71 is provided with the usual weight 76 which may be varied according to the pressure desired.

, When the pressure in the boiler decreases the.

piston rod 27 moves inwardly and opens the damper. At the same time the belt 65 pulls the weight 7 4 inwardly on the lever thereby reducing the. pressure exerted on the diahra until the ,arts are again brou ht to lialan i In ordei z to move the 'weiglIts 74 outwardly on the lever when the piston rod 27 is moved outwardly owing to an increase in pressure, I provide a. weight 77 which is suspended on a cord 78 passing over a pulley 79 journaled to an upwardl extending end portion of the lever 71 an thence passing along the lever 71 to the carriage 72 to which it is secured. While Lpreferably use the construction shown I'do not wish to limit myself to thisparticular form for instead of the weights 77, I may employ a spring or like device for moving theweight outwardly on the lever 71.

Fig. 3 of the drawings shows still another form of device by which the resistance to the pressure beneath the diaphragm 13 may be varied. In this device the piston rod 27 is provided with an arm 81 having a hook 82 to which is secured a chain 83 which passes overa pulley 84 journaled in a support 85 secured to the body 86 of the device and thence passes downwardly to a weight chain 87. The chain 87 is composed of a plurality of weights 88 secured together by links 5 and arranged with one end secured to the chain 83 and the other secured to the end of the weight lever 9 by means of a link connection 91. The lever 9 is provided with the usual weight 92 and additional sliding weight 93 which latter weight is not essential to the operation of the device but which forms a convenient means for making a ready and quickadjustment. The weight 93 is loosely mounted upon the lever 9 and is secured to it by a set screw 94.

The device just described operates similarly to the devices herei-nabove described. When the rod 27 moves outwardly the damper is closed and additional weight is added to theweighted lever 9, the support of some of the weights 88 being transferred to the lever 9 and taken ofi the chain 83. In this I manner a movement of the piston rod serves to vary the resistance to the pressure beneath the diaphragm so that a graduated movement is obtained.

While I have shown the device employed in connection with a furnace damper, I wish it to be understood that I do not limit myself to this type of pressure control for the device may equally well be employed in connection with any other form of boiler or other pressure controlling devices such as arheostat pressure valve or the like.

What I claim is:

1. In a regulator, in combination with a diaphragm which is subjected 'on one side to initial pressure, a lever which acts on the other side of the diaphragm to resist the initial pressure, a cylinder having a double acting piston with a stem projecting from one end thereof, a pilot valve which controls the entrance of fluid to either side of said piston, said pilot valve having a stem, said straddling said lever in such manu er that the said lugs of the lever engage said. yoke as a fulcrum, said lever having an extension member rigidly connected therewith, a pivot connection between said extension member of the lever and the stem ofsaid pilot valve, a weight mounted on said lever and movable with relation thereto, and means connecting said weight with the stem of said piston, so constructed and arranged that the movement of the piston in one direction causes the movement of said weight in relation to the lever.

2. In a regulator, in combination with a diaphragm which is subjected on one side to initial pressure, a lever which acts on the other side of the diaphragm to resist the initial pressure, a cylinder the axis of which is above and parallel to the said lover, a piston in the said. cylindene pilot valve which controls the entrance of fluid to said cylinder to actuate saidpiston, said pilot valve having a stem, a connection between said stem and said lever,- a weight Carrie e slidebly mounted on said lever and move le thereon in 'a line substantially parallel with the line of travel of the piston, a Weight supported by said carriage, an arm extending from said Amen H. Moninsbn. 

